Calculate
Network address, broadcast address, masks, host ranges, and subnet splits.
About
CIDRHub turns subnet math into practice.
A focused learning workspace for cloud networking, IPv4 CIDR calculation, subnet splitting, and provider planning notes.
Built for cloud learners and builders.
CIDRHub Learning is built for students, cloud certification learners, junior engineers, and anyone planning cloud networks. Created by Mahammad Rafi for CIDRHub, it keeps calculations, examples, and design reminders together so subnetting becomes easier to apply.
The site focuses on the practical questions teams face before they create VPCs, VNets, subnets, Kubernetes clusters, VPNs, peering, private endpoints, and shared cloud environments.
Understand
Plain-language lessons explain the reason behind each number.
Apply
Cloud notes connect CIDR planning to VPCs, VNets, subnets, and clusters.
Focus areas
What the platform helps you learn.
Each topic is connected back to cloud design so the numbers become useful in real architecture work.
IPv4 CIDR ranges
Understand prefixes, masks, wildcard masks, ranges, and host capacity.
Subnet planning
Split larger blocks into smaller networks for tiers, zones, clusters, and services.
Cloud readiness
Plan non-overlapping ranges before provider deployment, peering, VPN, or Kubernetes networking.